hey, i am wanting to put a sub into my stereo system (main unit, two speakers) but the main unit doesn't have a sub out plug. i was wondering if it's alright to put the (powered) sub in using the speaker wires eg. split negative wire off right speaker and positive off left and hook up to positive and negative of sub. i haven't bought a sub yet, i'm waiting to see if its possible. i also want to leave the speakers running of the unit's amp and not mess too much with them. will this type of setup work or not?